Renishaw NC1 Programming Manual page 30

Beam alignment
CAUTION: R07=d input
!
When specifying the value of the R07=d input, take care
that it will not allow any part of the tool holder to make
contact with the NC1 tool setting system. The projection of the
calibration tool should be at least 35 mm (1.38 in) if the default R26=z
input is used for the incremental measuring depth.
R07=d d= The span between the reference measuring points.
For greatest accuracy, the span value must be as large
as possible, compatible with the gap between the NC1
system transmitter and receiver and the size of the
calibration tool.
R14=t t= Tool offset edge length value to be used in the beam
alignment calculations.
R14=3 Uses the current tool offset, edge D3.
If R14 is not input, the current tool offset edge (D) is
used. The current tool is the number of the tool in the
spindle.
If neither the R06=k nor R14=t input is used, the
current tool offset and tool edge (D) is used for
calibration data.
R17=q q= Overtravel distance and radial clearance.
For details, see "Setting-data subroutine L9760" on
page 13.
Default value: 5.0 mm (0.197 in)
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